0.67-0.81 Cts of 4 mm AAA Round Swiss Blue Topaz ( 2 pcs ) Loose Gemstones The loose pair of round Swiss Blue Topaz has the finest AAA quality bright blue colored gems measuring 4 mm each. AAA quality Topaz are Loop clean gemstones, with no visible nicks, or inclusions. The color is even and consistent. Blue topaz is created by treating a natural colorless topaz. 30 Day No questions asked Return Policy Free-Shipping within US Loose Swiss Blue Topaz / December Birthstone